摘要
激光陀螺最适合于构成捷联惯性导航系统 ,是当前捷联惯性导航系统的重要应用研究方向 ,其航姿算法精度对激光捷联惯性导航系统的精度影响很大。本文应用激光陀螺当前迭代周期内及前两个迭代周期内的角增量输出 ,并根据在一个迭代周期内对陀螺仪采样的次数 ,提出了三种新的航姿算法表达式 ,并分析了此算法在典型圆锥运动输入下的漂移误差。仿真结果表明与传统的旋转矢量法比较 ,该新算法具有较高的精度 ,为改进旋转矢量算法提供了一种新的思路。
The laser gyro is most su it able for building the strap down inertial navigation system (SINS), and its acc uracy of attitude algorithm can enormously affect that of the laser SINS. This p aper develops three improved algorithmal expressions for strap down attitude ut ilizing the angular increment output by the laser gyro from the last two and cur rent updating periods according to the number of gyro samples, and analyses the algorithm error in the classical coning motion. Compared with the conventional algorithms, simulational results show that this improved algorithm has higher precision. A new way to improve the rotation vector algorithms is provided.
基金
国防预研基金资助项目~~
关键词
激光陀螺
捷联惯性导航系统
旋转矢量
航行姿态算法
laser gyro
strap down attitude algo rithm
coning motion
rotation vector
error analysis
quaternion
